boost/intrusive/trivial_value_traits.hpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga  2006-2008
   4 //
   5 // Distributed under the Boost Software License, Version 1.0.
   6 //    (See accompanying file LICENSE_1_0.txt or copy at
   7 //          http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // See http://www.boost.org/libs/intrusive for documentation.
  10 //
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef BOOST_INTRUSIVE_TRIVIAL_VALUE_TRAITS_HPP
  14 #define BOOST_INTRUSIVE_TRIVIAL_VALUE_TRAITS_HPP
  15
  16 #include <boost/intrusive/link_mode.hpp>
  17
  18 namespace boost {
  19 namespace intrusive {
  20
  21 //!This value traits template is used to create value traits
  22 //!from user defined node traits where value_traits::value_type and
  23 //!node_traits::node should be equal
  24 template<class NodeTraits, link_mode_type LinkMode = normal_link>
  25 struct trivial_value_traits
  26 {
  27    typedef NodeTraits                                          node_traits;
  28    typedef typename node_traits::node_ptr                      node_ptr;
  29    typedef typename node_traits::const_node_ptr                const_node_ptr;
  30    typedef typename node_traits::node                          value_type;
  31    typedef node_ptr                                            pointer;
  32    typedef const_node_ptr                                      const_pointer;
  33    static const link_mode_type link_mode = LinkMode;
  34    static node_ptr       to_node_ptr (value_type &value)       {  return node_ptr(&value); }
  35    static const_node_ptr to_node_ptr (const value_type &value) {  return const_node_ptr(&value); }
  36    static pointer        to_value_ptr(node_ptr n)              {  return pointer(n); }
  37    static const_pointer  to_value_ptr(const_node_ptr n)        {  return const_pointer(n); }
  38 };
  39
  40 } //namespace intrusive
  41 } //namespace boost
  42
  43 #endif //BOOST_INTRUSIVE_TRIVIAL_VALUE_TRAITS_HPP